Class CIM_AFService
extends CIM_DiffServService

This class represents a specialization to the general concept of forwarding network traffic by adding specific semantics that characterize the operation of the Assured Forwarding (AF) Service (RFC2597). This RFC defines four different AF classes to represent four different treatments of traffic (e.g., a different amount of forwarding resources, such as buffer space and bandwidth, are allocated). Within each AF class, IP packets are marked with one of three possible drop precedence values. The drop precedence of a packet determines the relative importance of that packet compared to other packets within the same AF class if congestion occurs. A congested interface will try to avoid dropping packets with a lower drop precedence value by instead discarding packets with a higher drop precedence value. Note that [R2597] defines 12 DSCPs that together represent the AF Per Hop Behavior (PHB) group. Implementations are free to extend this (e.g., add more classes and/or drop precedences). The AFService class is modeled as a specialization of DiffServService, which is in turn a specialization of QoSService. This enables it to be related to higher-level QoSServices, as well as to lower-level conditioning sub-services (e.g., classification, metering, dropping, queuing, and others).

Table of Contents
Hierarchy
Direct Known Subclasses
Class Qualifiers
Class Properties
Class Methods

Class Hierarchy

CIM_ManagedElement
   |
   +--CIM_ManagedSystemElement
   |
   +--CIM_LogicalElement
   |
   +--CIM_EnabledLogicalElement
   |
   +--CIM_Service
   |
   +--CIM_QoSService
   |
   +--CIM_DiffServService
   |
   +--CIM_AFService

Direct Known Subclasses

Class Qualifiers

NameData TypeValue
DescriptionstringThis class represents a specialization to the general concept of forwarding network traffic by adding specific semantics that characterize the operation of the Assured Forwarding (AF) Service (RFC2597). This RFC defines four different AF classes to represent four different treatments of traffic (e.g., a different amount of forwarding resources, such as buffer space and bandwidth, are allocated). Within each AF class, IP packets are marked with one of three possible drop precedence values. The drop precedence of a packet determines the relative importance of that packet compared to other packets within the same AF class if congestion occurs. A congested interface will try to avoid dropping packets with a lower drop precedence value by instead discarding packets with a higher drop precedence value. Note that [R2597] defines 12 DSCPs that together represent the AF Per Hop Behavior (PHB) group. Implementations are free to extend this (e.g., add more classes and/or drop precedences). The AFService class is modeled as a specialization of DiffServService, which is in turn a specialization of QoSService. This enables it to be related to higher-level QoSServices, as well as to lower-level conditioning sub-services (e.g., classification, metering, dropping, queuing, and others).
UMLPackagePathstringCIM::Network::QoS
Versionstring2.7.0

Class Properties

Local Class Properties

NameData TypeDefault ValueQualifiers
NameData TypeValue
ClassNumberuint8
DescriptionstringThis property is an 8-bit unsigned integer that indicates the number of AF classes that this AF implementation uses. Among the instances aggregated into AFService (using QoSConditioningSubService), one SHOULD find markers with as many distinct values as is indicated by ClassNumber.
DropperNumberuint8
DescriptionstringThis property is an 8-bit unsigned integer that indicates the number of drop precedence values that this AF implementation uses. The number of drop precedence values is the number PER AF CLASS. The corresponding droppers are found in the collection of ConditioningServices aggregated by QoSConditioningSubService.

Inherited Properties

NameData Type
Captionstring
CommunicationStatusuint16
CreationClassNamestring
Descriptionstring
DetailedStatusuint16
DSCPuint8
ElementNamestring
EnabledDefaultuint16
EnabledStateuint16
Generationuint64
HealthStateuint16
InstallDatedatetime
InstanceIDstring
LoSIDstring
LoSOrgIDstring
Namestring
OperatingStatusuint16
OtherEnabledStatestring
PHBIDuint16
PrimaryOwnerContactstring
PrimaryOwnerNamestring
PrimaryStatusuint16
RequestedStateuint16
Startedboolean
StartModestring
Statusstring
SystemCreationClassNamestring
SystemNamestring
TimeOfLastStateChangedatetime
TransitioningToStateuint16
AvailableRequestedStatesuint16[]
OperationalStatusuint16[]
StatusDescriptionsstring[]

Class Methods

Inherited Class Methods

NameReturn Type
ChangeAffectedElementsAssignedSequenceuint32
RequestStateChangeuint32
StartServiceuint32
StopServiceuint32